Question

Neurotransmitter molecules move across the synaptic cleft by what process?

Answer 1

Answer:

Neurotransmitter molecules simply diffuse across the synaptic cleft.

Explanation:

Neurotransmitters are secreted by secretory vesicles present in axonic end. The molecules diffuse across cleft and on the dendritic membrane there are specific receptors for neurotransmitters.

Answer 2

A common or traditional definition of matter is "anything that has mass and volume (occupies space)". For example, a car would be said to be made of matter, as it has mass and volume (occupies space). The observation that matter occupies space goes back to antiquity.